/Engine/Source/Runtime/Engine/Classes/Components/SkeletalMeshComponent.h
Set all of the bones below passed in bone to be simulated
void SetAllBodiesBelowPhysicsBlendWeight ( const [FName](API\Runtime\Core\UObject\FName) & InBoneName, float PhysicsBlendWeight, bool bSkipCustomPhysicsType, bool bIncludeSelf )